EP 1561287 B1 20090325 - EARLY-LATE SYNCHRONIZER HAVING REDUCED TIMING JITTER
Title (en)
EARLY-LATE SYNCHRONIZER HAVING REDUCED TIMING JITTER
Title (de)
FRÜH-SPÄT SYNCHRONISIEREINRICHTUNG MIT VERRINGERTEM ZEIT-JITTER
Title (fr)
SYNCHRONISEUR PRECOCE / TARDIF A GIGUE DE TEMPORISATION REDUITE
Publication
Application
Priority
EP 0212814 W 20021115
Abstract (en)
[origin: WO2004047327A1] A device for maintaining fine alignment between an incoming spread spectrum signal and a locally generated code in a digital communication receiver comprises: - a delay line (56) for storing a plurality of consecutive samples (E-1, E, M, L, L+1) of the incoming spread spectrum signal; - three digitally controlled interpolators (24, 26, 28) for determining by interpolation between consecutive samples an interpolated early sample (e), an interpolated middle sample (m) and an interpolated late sample (1); - two correlators (30, 32) for calculating an error signal (xi) as the difference between the energy of the symbols computed from the interpolated early (e) and late (1) samples; - a circuit for generating a control signal (S¿OUT<) for controlling the interpolation phase of the digitally controlled interpolator (24) for the early sample (e), and - a digital non-linear filter (68), for smoothing the control signal (S¿OUT?) of the interpolator (24) for the early sample (e), enabling the update operation of the control signal only when the absolute value (||xi(n)||) of the error signal at a time instant n is smaller than the absolute value (||xi(n-1)||) of the same error signal at a time instant n-1.
IPC 8 full level
H04B 1/707 (2011.01); H04W 56/00 (2009.01)
CPC (source: EP US)
H04B 1/7085 (2013.01 - EP US); H04B 1/709 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
WO 2004047327 A1 20040603; AT E426952 T1 20090415; AU 2002352020 A1 20040615; AU 2002352020 A8 20040615; BR 0215941 A 20050906; CA 2509189 A1 20040603; CN 100452669 C 20090114; CN 1695314 A 20051109; DE 60231754 D1 20090507; EP 1561287 A1 20050810; EP 1561287 B1 20090325; JP 2006506864 A 20060223; JP 4183683 B2 20081119; US 2006251154 A1 20061109; US 7515670 B2 20090407
DOCDB simple family (application)
EP 0212814 W 20021115; AT 02787695 T 20021115; AU 2002352020 A 20021115; BR 0215941 A 20021115; CA 2509189 A 20021115; CN 02829891 A 20021115; DE 60231754 T 20021115; EP 02787695 A 20021115; JP 2004552437 A 20021115; US 53499205 A 20051116